Fein Multi-Master cuts right through tough old caulk like a hot knife!
Hello, I found that a Fein Mulit-Master fitted with the scraper blade cuts right through tough old caulk like a hot knife, because it is actually a hot knife. The oscillations against the caulk generate heat. I cut away about 1/16" thick layer and big gobs of caulk from this 18 x 26 skylight frame in about 5 minutes, when it would have taken much longer with a putty knife. It takes a minute or to get the angle & speed right, so that you only cut down to the paint or just leave a very thin layer of caulk to clean up with a solvent. If you're too enthusiastic, it will cut right down to the aluminum, which may not be a problem in some circumstances or where it could be repainted easily. It sure made removing the bath vent far easier too!
There are similar tools from other manufacturers - e.g. Bosch, Harbor Freight, but the Fein is very well-balanced and doesn't cause as much vibration stress to the hand.